Thank You very much for the precious recomendations, I'll try them probably in the next weekend.
Another questions: how can cursor be moved with the LCD4Bit library?
The job is to start motor after pressing "Run" button and then count pulses from the 3 different inputs. After receiving preprogrammed quantity of pulses from one input, motor should stop and all results be shown on screen. Another task is to measure time between the "Run" button was pressed and the last pulse was received. But how the working time could be measured?